JP2712901B2 - lift device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting apparatus capable of always holding a load such as a part at a constant level so that loading, unloading, picking and picking can be performed in a comfortable posture.

[0002]

2. Description of the Related Art Conventionally, as an elevating device of this type, for example, an automatic up-and-down moving work cart disclosed in Japanese Utility Model Publication No. 54-16427 has been provided. In this conventional type, a vehicle body is formed in a rectangular plate frame shape, wheels are arranged at four corners thereof, and a column is erected from a rear portion of the vehicle body.

[0003] A mounting table is provided which moves up and down while being guided by the column side, and a chain is arranged between the mounting table and the upper part of the column via a fixed quantity sprocket. A movable sprocket is hung on the chain. A plurality of springs are arranged between a hanger plate on which the movable sprocket is mounted and a vehicle body, and a fixing hydraulic cylinder is provided.

[0004] According to this conventional type, the mounting table is suspended via a spring group. Therefore, when a load is not loaded on the mounting table, the restoring force of the spring group causes the mounting table to be above the support column. It is suspended. When a load is placed on the mounting table, the tension applied to the chain causes the hanger plate to rise against the contraction force of the spring group, thereby lowering the mounting table in accordance with the load.
Such an operation is performed with the hydraulic cylinder opened, and by appropriately closing the hydraulic cylinder, the mounting table stops at that position regardless of the load.

[0005]

However, according to the above-mentioned conventional type, since the upper end and the lower end of the spring group are fixed to the hanger plate and the vehicle body, respectively, it is impossible to cope with a change in the maximum load.

That is, when a load having the same maximum load is always handled, a spring group corresponding to the maximum load may be set. However, a spring group corresponding to a certain maximum load is set on a mounting table. When a load with a light maximum load is placed, the mounting table does not fully lower, and when a load with a heavy maximum load is placed, the mounting table reaches the lower limit.The lower limit is reached until a considerable amount of parts are removed. It was difficult to work in both cases.

An object of the present invention is to provide an elevating device capable of always holding the uppermost load at a constant level even when handling loads having different maximum loads.

[0008]

According to a first aspect of the present invention, there is provided a carriage capable of moving up and down, a driving device for moving the carriage up and down, and a load mounted on the carriage. Upper detection device and lower detection device
It provided a detection device, the upper end of the uppermost load on carriage
Is provided with a control device for controlling the driving device so as to move the carriage up and down until a certain level between the upper and lower detection devices is reached.

In the second invention, a higher-order detection device and a lower-order detection device are provided.
The vertical spacing with the delivery device is set smaller than the height of the load.
It is. According to the third aspect of the invention, a movable carriage is provided.
And a driving device for raising and lowering the carriage is provided.
The upper-level detection device that detects the load placed on the storage
And a lower detection device, and the uppermost
Raise and lower the carriage until the bottom of the load reaches a certain level
A control device for controlling the driving device is provided to
Things.

According to a fourth aspect of the present invention, a higher-level detection device includes a plurality of optical devices.
Line sensor with electrical switches arranged in a straight line in the vertical direction
And the uppermost stack stacked by the upper detection device.
At the border between the load of
Detect the level and above based on the detected groove level
Calculates the height of the load one step below the top load.
You.

According to a fifth aspect of the present invention, a carriage capable of moving up and down is provided.
A driving device for moving the carriage up and down,
A detection device that detects a load placed on the above-mentioned carriage
The upper and lower ends of the uppermost load on the carriage
Raise and lower the carriage until it reaches a certain level
A control device for controlling the driving device is provided so that
Keep the upper end of the top load at a certain level
Switching means to select whether to keep at a certain level
It is provided.

[0012]

According to the first aspect of the invention, the carriage is mounted on the carriage.
When a load is placed, the upper and lower detectors detect the load,
The more control device lowers the carriage, the higher detection device
When the control no longer detects the load, the control
To stop. Also, carry the topmost load
When removed from the top, the upper and lower detectors do not detect the load,
This causes the control unit to raise the carriage and lower
When only the unloading device detects the upper end of the load, the control device
Stop the luggage. This allows loads with different maximum loads
Even when handling, always always automatically top of the top load
A certain level between the upper and lower detectors between the upper and lower detectors
Can be held in

According to the configuration of the second aspect , both upper and lower detections are performed.
There is no undetected load between the devices,
The load placed on the carriage is reliably detected by the upper and lower detectors.
Erroneous detection can be prevented.

According to the third aspect of the invention, the control device is
By controlling the raising and lowering of the carriage, the top
Is kept at a constant level. Of the fourth invention
According to the configuration, when the load is stacked,
The groove at the boundary between the load at the stage and the load one stage below this top load
Level is detected by the detector of the upper. This allows
The controller determines that the load has been newly loaded and
The height of the next lower load is calculated based on the
Lower the carriage by the height of the load. This
It is possible to keep the lower end of the uppermost load at a certain level.
Wear. In addition, I took out the top load from the carriage
In this case, the lower detection device does not detect the load,
The device determines that the topmost load has been removed and
Raise the carriage by the height of the load one step below
You. This keeps the lower end of the top load at a constant level
can do.

According to the fifth aspect of the invention, the switching means
Steps keep the top of the top load at a constant level
And that the lower end of the top load is kept at a certain level.
And can be switched.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a bogie as an example of a lifting device, and a base 2 has a cross frame 2B connecting a pair of left and right side frames 2A and an intermediate portion near the rear end of the side frames 2A. Is formed into an H shape by
It has recessed parts 2C and 2D before and after the crossover frame 2B. Wheels 3 are mounted on the lower surfaces of the front and rear portions of the two side frames 2A.

[0017] From the transition frame 2B to the two-sided frame 2
The support member 4 is erected from the upper surface over A. The support member 4 includes a pair of left and right posts 5 erected from both side frames 2A, a back panel 6 disposed between the rear surfaces of the posts 5, and a front panel 7 disposed between the front surfaces of the posts 5. And an upper resin cover 8 disposed between the upper ends of both posts 5. Vertical slits 9 are formed at both ends of the front panel 7.

Each of the posts 5 is an aluminum rail, and guide grooves 10 are formed vertically on the opposing inner surfaces over the entire length. A handle 11 is provided on the rear side of the upper part of the support member 4. The handle 11 is a pair of right and left brackets fixed to the rear side of the posts 5 and extending rearward.
12 and a left-right pipe body 13 attached between the free ends of the brackets 12.

A carriage 14 having a load receiving table 18 and a guide roller device 19 is provided on the column member 4 so as to be able to move up and down. The above-mentioned guide roller device 19 is formed in a box, and is provided with guide rollers 15 and 16 provided at upper and lower portions on both side surfaces.
And a connecting member connected forward from both ends of the lower front part
It consists of 17. The guide rollers 15 and 16 are made of resin and are fitted in the guide grooves 10 of the post 5 to be guided up and down. Further, the connecting member 17 is connected to the slit 9
, And protrudes outward from the front surface of the support member 4, and can be moved up and down on the front surface side. The load receiving table 18 is disposed in front of the support member 4, and the load receiving table 18 is fixed between a pair of left and right connecting members 17.

A pair of left and right rings 20 and 21 are provided in the upper and lower portions of the support member 4. A pair of left and right lower wheel bodies 21 are externally fitted to a horizontally disposed rotating shaft 22, and both ends of the rotating shaft 22 are rotatably supported by bearings (not shown). It is supported by. In addition, the pair of left and right upper wheels 20 are externally fitted to the horizontally disposed rotating shaft 22,
One end of the rotating shaft 22 is rotatably supported on the inner surface of one of the posts 5 via a bearing (not shown).
Is connected to the electric motor 23.

An endless rotating body 24 is provided between one upper and lower wheels 20, 21 and between the other upper and lower wheels 20, 21 respectively.
(Chains, wires, etc.) are wound. The upper and lower surfaces of the guide roller device 19 are connected to both ends of the endless rotating body 24.

At the top of the front panel 7 and in the center in the left-right direction, a photoelectric switch 2 which is an example of a detection device is provided.
6, 27 are provided at the upper and lower two places. The upper photoelectric switch 26 is an aggregate of a plurality of photoelectric switches, in which individual photoelectric switches are linearly arranged for each level. Length H1 of this upper photoelectric switch 26 (see FIG. 4)
Is set to be larger than the maximum height h1 of the various loads 28. The vertical interval H2 between the upper photoelectric switch 26 and the lower photoelectric switch 27 (see FIG. 4) is set smaller than the minimum height h2 of the various loads 28 placed on the load receiving table 18.

On the upper part of the back panel 6, a switching lever 31 for the upper photoelectric switch 26 (one of the switching means) is provided.
Example) is provided. When the switching lever 31 is switched to one, the photoelectric switch located at the lower end of the plurality of photoelectric switches forming the upper photoelectric switch 26
Only 26a functions, and the other photoelectric switches stop functioning. When the switching lever 31 is switched to the other, all the photoelectric switches forming the upper photoelectric switch 26 function, and the upper photoelectric switch 26 functions as a line sensor.

A control device 29 is provided in the upper part of the support member 4.
The electric motor 23, the switching lever 31, and the upper and lower photoelectric switches 26 and 27 are connected to a control device 29, respectively. As a result, the control device 29
Based on the detection signals of the lower photoelectric switches 26 and 27, the motor
Drive control of 23. 32 is a main power switch.

The operation of the above configuration will be described below.
First, when the switch of the main power supply 32 is turned on, the switching lever 31 is switched to one as shown by the solid line in FIG. 2, and only the photoelectric switch 26a located at the lower end of the upper photoelectric switch 26 is operated. , The loading table 18 moves up and down based on the following control.

That is, when no load 28 is placed on the load receiving table 18, neither the upper photoelectric switch 26a nor the lower photoelectric switch 27 detects the load 28, as shown in FIG. The receiving table 18 is always kept at a constant level L1 slightly lower than the lower photoelectric switch 27 by the control device 29.

As shown in FIG. 5, when a load 28a is placed on the load receiving table 18, the upper photoelectric switch 26a and the lower photoelectric switch 27 detect the placed load 28a, and the control device Send the detection signal to 29. Based on these detection signals, the control device 29 determines that the load 28a has been placed,
The drive of the electric motor 23 is controlled. As a result, the wheels 20, 21 and the endless rotating body 24 rotate, and the load receiving table 18 moves down together with the guide roller device 19. When only the upper photoelectric switch 26a stops detecting the load 28a as shown by the solid line in FIG.
Stops the electric motor 23. As a result, the uppermost load 28a
The upper ends of the upper photoelectric switch 26a and the lower photoelectric switch 27
It is kept at the constant level L2 between the two.

Further, a load indicated by a virtual line in FIG.
When stacking 28b, the upper photoelectric switch 26a and the lower photoelectric switch 27 detect the newly placed load 28b,
Each sends a detection signal to the control device 29. Based on these detection signals, the control device 29 determines that the load 28b is placed, and controls the drive of the electric motor 23. As a result, the loading table 18 moves down. Then, due to the downward movement of the load receiving table 18, only the upper photoelectric switch 26a is loaded as shown by the solid line in FIG.
When the detection of 28b is stopped, the control device 29 stops the electric motor 23. Thus, the upper end of the uppermost load 28b is maintained at the constant level L2.

Further, the load indicated by a virtual line in FIG.
When stacking 28c, the upper photoelectric switch 26a and the lower photoelectric switch 27 detect the newly placed load 28c,
Each sends a detection signal to the control device 29. Based on these detection signals, the control device 29 determines that the load 28c has been placed, and controls the drive of the electric motor 23. As a result, the loading table 18 moves down. Then, as shown in FIG. 8, when only the upper photoelectric switch 26a stops detecting the load 28c due to the downward movement of the load receiving table 18, the control device 29 stops the electric motor 23. As a result, the upper end of the uppermost load 28c is held at the fixed level L2.

In this state, the worker runs the cart 1 to the destination. That is, in order to move the cart 1 forward, the cart 1 may be manually pushed and run via the handle 11, and at this time, the hand pushing is performed while the toe is positioned near the recess 2D formed on the rear end side of the base 2. I can do it. In order to move the carriage 1 backward, the carriage 1 may be pulled and run via the handle 11. At this time, the pulling operation can be performed while the heel is located near the above-described recess 2D. Therefore, pushing by hand,
Both pulling and running can be performed without the foot colliding with the base 2 side.

After the carriage 1 is driven to the destination, for example, each load 28 is taken out one by one, processed, or stored in a storage shelf or the like. For this reason, when the uppermost load 28c in FIG. 8 is taken out from the load receiving table 18, as shown in FIG.
The upper photoelectric switch 26a and the lower photoelectric switch 27
c is not detected. Thereby, the control device 29 determines that the topmost load 28c has been taken out, and controls the drive of the electric motor 23. As a result, the endless rotating body 24 rotates, and the load receiving table 18 moves up together with the guide roller device 19. When only the lower photoelectric switch 27 detects the upper end of the load 28b as shown by the solid line in FIG. 7 due to the upward movement of the load receiving table 18, the control device 29 stops the electric motor 23. As a result, the upper end of the uppermost load 28b is held at the fixed level L2.

Further, the load on the uppermost stage shown by the solid line in FIG.
When the 28b is taken out of the loading table 18, the upper photoelectric switch 26a and the lower photoelectric switch 27 do not detect the load 28b as shown in FIG. Thereby, the control device 29
When it is determined that the uppermost load 28b has been taken out, the drive of the electric motor 23 is controlled. As a result, the loading table 18 moves upward. When only the lower photoelectric switch 27 detects the upper end of the load 28a as shown by the solid line in FIG. 6 due to the upward movement of the load receiving table 18, the control device 29 stops the electric motor 23. As a result, the upper end of the uppermost load 28a is maintained at the fixed level L2.

Further, the uppermost load shown by the solid line in FIG.
When the 28a is taken out of the loading table 18, the upper photoelectric switch 26a and the lower photoelectric switch 27 do not detect the load 28a. Thereby, the control device 29 determines that the uppermost load 28a has been taken out, and controls the drive of the electric motor 23. As a result, the loading table 18 moves upward. Then, as shown in FIG. 4, when the loading tray 18 rises to a certain level L1, the electric motor 23 automatically stops, so that the loading tray 18
It is maintained at the state before placing 28a, that is, at a constant level L1. As described above, by switching the switching lever 31 to one side, the upper end of the uppermost load 28 can be held at the constant level L2. And after using the cart 1,
Turn off the main power supply 32.

The lifting and lowering movement of the load receiving table 18 is performed on a fixed path by the guide rollers 15, 16 of the guide roller device 19 being guided by the guide grooves 10. At this time, the upper guide roller 15 is guided by the front guide surface and the lower guide roller 16 is guided by the rear guide surface due to the unbalanced load applied to the load receiving table 18.

Next, the switching lever 31 is switched to the other as shown by the phantom line in FIG.
Is operated as a line sensor, the loading table 18 moves up and down based on the following control.

That is, as shown in FIG.
When no load 28 is placed on the upper side, the lower photoelectric switch 27 does not detect the load 28, and therefore, the load receiving table 18 is always slightly lower than the lower photoelectric switch 27 by the control device 29. It is kept at a certain level L1.

As shown by the solid line in FIG. 11, when the load 28a is placed on the
Detects the placed load 28a and sends a detection signal to the control device 29. At this time, the control device 29 determines that the first load 28a has been placed on the load receiving table 18 and does not drive the electric motor 23, so that the load receiving table 18 is kept at the constant level L1. As a result, the lower end of the load 28a is maintained at the constant level L1.

Further, a load indicated by a virtual line in FIG.
When 28b is stacked, the upper photoelectric switch 26 detects the level of the groove 36 (boundary) between the load 28a and the load 28b. Accordingly, the control device 29 determines that the load 28b has been newly stacked, and based on the detected level of the groove 36, the load 28a.
Is calculated, the motor 23 is driven and controlled, and the load receiving table 18 is moved down from the fixed level L1 by the distance ha.
As a result, as shown in FIG. 12, the lower end of the uppermost load 28b is maintained at the constant level L1.

Similarly to the above, the load 28c shown by the imaginary line in FIG.
When the upper photoelectric switch 26 is stacked on the load 28b,
The level of the groove 37 (boundary) between 28b and the load 28c is detected. Accordingly, the control device 29 determines that the load 28c has been newly stacked, calculates the height hb of the load 28b based on the detected level of the groove 37, and controls the drive of the electric motor 23 to control the load receiving table 18 Is moved downward by the distance hb. This allows
As shown in FIG. 14, the lower end of the uppermost load 28c is at a constant level L.
It is held at 1. The heights ha, hb of the loads 28a, 28b
Are stored in the control device 29 in the order in which they are placed.

When the uppermost load 28c is taken out from the load receiving table 18, the lower photoelectric switch 27 does not detect the load 28c as shown by the solid line in FIG. As a result, the control device 29 determines that the uppermost load 28c has been taken out, and based on the height hb of the load 28b stored in the memory, drives and controls the electric motor 23 to move the load receiving table 18 up by the distance hb. Let it.
As a result, as shown by a virtual line in FIG.
The lower end of b is held at a constant level L1.

Similarly to the above, when the uppermost load 28b indicated by the imaginary line in FIG. 15 is taken out from the loading table 18, the lower photoelectric switch 27 does not detect the load 28b as indicated by the solid line in FIG. . As a result, the control device 29 determines that the uppermost load 28b has been taken out, and based on the height ha of the load 28a stored in the memory, drives and controls the electric motor 23 to move the load receiver 18 up by the distance ha. Let it. As a result, as shown by the imaginary line in FIG. 16, the lower end of the uppermost load 28a is at the fixed level L1.
Is held.

Further, when the load 28a indicated by the phantom line in FIG. 16 is taken out from the load receiving table 18, the lower photoelectric switch 27 does not detect the load 28a as shown in FIG. Thereby, the control device 29 determines that the load 28a has been taken out. At this time, since the memory other than the heights ha and hb is not stored in the control device 29, the control device 29 determines that the load 28 does not exist on the load receiving table 18, and does not drive the electric motor 23. As a result, the load receiving table 18 is maintained in a state before the first load 28a is placed, that is, at the fixed level L1. As described above, by switching the switching lever 31 to the other,
The lower end of the uppermost load 28 can be kept at a constant level L1.

In the above embodiment, by switching the switching lever 31, either the upper end or the lower end of the uppermost load 28 can be selected and held at a constant level. Thus, the worker can lift the uppermost load 28 in a comfortable posture and perform the unloading operation of the load 28.

In the above embodiment, a photoelectric switch is used as the detecting device.
Since the loads 26 and 27 are used, the load 28 can be detected even if the load 28 is placed with a shift in the front-rear direction. In the above embodiment, the electric motor 23 is provided as an example of the driving device, and the carriage 14 is moved up and down by the electric motor 23, so that highly accurate control can be performed.

In the above embodiment, when the uppermost load 28 is taken out with the switching lever 31 switched to the other position, the load receiving table 18 is moved up by the heights ha and hb of the loads 28a and 28b and stopped. The lower photoelectric switch 27
Detects the groove 36 between the loads 28a and 28b,
May be controlled so as to stop the upward movement.

In the above embodiment, as shown in FIG.
A vertical slit 38 is formed in the center of the front panel 7, and the upper photoelectric switch 26 and the lower photoelectric switch 27 are mounted so as to be vertically movable along the slit 38, thereby changing the set values of the fixed levels L1 and L2. You may be able to.

In the above embodiment, the upper photoelectric switch 26 and the lower photoelectric switch 27 are provided as an example of the detecting device.
Instead of the photoelectric switches 26 and 27, an upper sonic sensor and a lower sonic sensor may be provided.

In the above embodiment, the upper photoelectric switch 26 and the lower photoelectric switch 27 are provided as an example of the detecting device.
Instead of the photoelectric switches 26 and 27, an upper magnetic proximity switch and a lower magnetic proximity switch are provided.
However, a magnetic tape may be attached to a side surface facing the magnetic proximity switch.

[0049]

As described above, the first aspect of the present invention
According to, when a load is placed on the carriage, both upper and lower
The device detects the load, which allows the control to clear the carriage.
Lowered, only the upper detection device stopped detecting the load
At that time, the controller stops the carriage. Also placed
When you take out the load on the top of the
The detector does not detect the load, which causes the controller to carry
The upper edge of the load only by the lower detection device
Then, the controller stops the carriage. This
Ri, even when dealing with different load of maximum load, always automatically upper detector and a lower detector upper end of the uppermost load
It can be kept at a certain level between the top and bottom of the device . Therefore, the work of placing a load on the carriage and the work of removing the load from the carriage can always be performed at a constant level regardless of the load of the load.Therefore, it is not necessary for the operator to take an unreasonable posture, and the unloading work can be performed. Easy to do.

According to the second aspect of the present invention, the device is placed on the carriage.
The detected load can be reliably detected by the upper and lower detectors.
Error detection can be prevented. According to the third invention
For example, even when handling loads with different maximum loads,
The lower end of the upper load can be automatically kept at a constant level. I
Therefore, the work of placing a load on the
The work to remove the load from the ledge is independent of the load
Since the work can always be performed at a constant level, the worker must take an unreasonable posture.
It is not necessary to carry out the loading and unloading work easily.

According to the fourth aspect, when a load is stacked,
Stacked top-level load and one level higher than this top-level load
The level of the groove at the boundary with the lower load is detected by the upper detection device.
It is. As a result, the control device
And calculate the height of the next lower load based on this
And lower the carriage by the calculated height of the next lower load.
Let it. As a result, the lower end of the uppermost load is automatically fixed.
Can be held on level . Also, remove the top load.
When unloading from the College, the lower detection device detects the load.
And the control unit removes the top load.
Judgment was made, and it is the height of the load that is stored one step below
Raise the carriage. This allows the topmost load
The lower end can be automatically kept at a certain level.

According to the fifth aspect, the switching means provides
To maintain the upper end of the top load at a constant level,
Keep the lower end of the top load at a certain level
Can be changed so that the worker must take an unreasonable posture.
It is unnecessary, and the unloading work can be performed more easily.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lifting device according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a schematic side view showing a detection device and a carriage before a load is placed on the lifting device.

FIG. 5 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on an elevating device after switching a switching lever to one side.

FIG. 6 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 7 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 8 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 9 is a schematic side view showing detection of the detection device and movement of the carriage when a load is taken out from the lifting device.

FIG. 10 is a schematic side view showing detection of a detection device and movement of a carriage when a load is taken out from the lifting device.

FIG. 11 is a schematic side view showing detection of the detection device and movement of the carriage when a load is placed on the elevating device after switching the switching lever to the other side.

FIG. 12 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 13 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 14 is a schematic side view showing detection of a detection device and movement of a carriage when a load is placed on the lifting device.

FIG. 15 is a schematic side view showing detection of a detection device and movement of a carriage when a load is taken out from the lifting device.

FIG. 16 is a schematic side view showing detection of a detection device and movement of a carriage when a load is taken out of the lifting device.

[Explanation of symbols]

 1 truck (elevating device) 14 carriage 23 motor (drive device) 26, 26a Upper photoelectric switch (detector) 27 Lower photoelectric switch (detector) 28, 28a, 28b, 28c Load 29 Controller L1, L2 Constant level

Claims (5)

(57) [Claims] A carriage capable of moving up and down is provided, a driving device for moving the carriage up and down is provided, and a higher-order detection device for detecting a load placed on the carriage and a lower-order detection device.
A detection device is installed, and the upper end of the top load on the carriage is
A lift device, comprising: a control device for controlling the drive device so as to move the carriage up and down until a certain level between the upper and lower detection devices is reached. 2. The method according to claim 1, wherein the upper detection device and the lower detection device are connected to each other.
The lower interval is set smaller than the height of the load.
The lifting device according to claim 1. 3. A carriage capable of moving up and down is provided.
A drive device for moving the carriage up and down is provided,
The upper detection device and the lower detection device that detect the load placed on the
A detection device is provided, and the lower end of the load at the top of the carriage is
Raise and lower the carriage until a certain level is reached
A control device for controlling the driving device is provided.
And lifting device. 4. A high-order detection device includes a plurality of photoelectric switches.
These are line sensors arranged in a straight line in the vertical direction.
The uppermost load and the highest load
Detects the level of the groove at the boundary with the load one step below the load at the top
Based on the level of the detected groove,
Request to calculate the height of the cargo one step below
Item 3. The lifting device according to Item 3. 5. A carriage capable of moving up and down is provided.
A drive device for moving the carriage up and down is provided,
Provide a detection device that detects the load placed on the
Either the top or bottom of the topmost load on the
Move the carriage up and down until it reaches the bell
A control device for controlling the driving device is provided, and
Keep the upper end at a constant level and the lower end at a constant level
Switching means for selecting whether to hold
A lifting device.